Development of Installation Guidelines for Midwest Guardrail System in Combination with Roadside Curbs for MASH TL-3 Applications PDF Download
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Author: Scott K. Rosenbaugh
Publisher:
ISBN: 9780309709286
Category : Automobiles
Languages : en
Pages : 0
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Book Description
"While curbs are useful for many functions, highway design policies typically discourage the use of 6-inch- to 8-inch-tall curbs on high-speed roadways due to their potential to cause drivers to lose control in a crash. [This report] develops guidelines for the use and placement of 31-inch-tall Midwest Guardrail System adjacent to curbs under Manual for Assessing Safety Hardware (MASH) Test Level 3 impact conditions." -- publisher's website.
Author: Scott K. Rosenbaugh
Publisher:
ISBN: 9780309709286
Category : Automobiles
Languages : en
Pages : 0
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Book Description
"While curbs are useful for many functions, highway design policies typically discourage the use of 6-inch- to 8-inch-tall curbs on high-speed roadways due to their potential to cause drivers to lose control in a crash. [This report] develops guidelines for the use and placement of 31-inch-tall Midwest Guardrail System adjacent to curbs under Manual for Assessing Safety Hardware (MASH) Test Level 3 impact conditions." -- publisher's website.
Author: David A. Gutierrez
Publisher:
ISBN:
Category : Road work zones
Languages : en
Pages : 232
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Book Description
Often, road construction causes the need to create a work zone. In these scenarios, portable concrete barriers (PCBs) are typically installed to shield workers and equipment from errant vehicles as well as prevent motorists from striking other roadside hazards. For an existing W-beam guardrail system installed adjacent to the roadway and near the work zone, guardrail sections are removed in order to place the portable concrete barrier system. The focus of this research study was to develop a proper stiffness transition between W-beam guardrail and portable concrete barrier systems. This research effort was accomplished through development and refinement of design concepts using computer simulation with LS-DYNA. Several design concepts were simulated, and design metrics were used to evaluate and refine each concept. These concepts were then analyzed and ranked based on feasibility, likelihood of success, and ease of installation. The rankings were presented to the Technical Advisory Committee (TAC) for selection of a preferred design alternative. Next, a Critical Impact Point (CIP) study was conducted, while additional analyses were performed to determine the critical attachment location and a reduced installation length for the portable concrete barriers. Finally, an additional simulation effort was conducted in order to evaluate the safety performance of the transition system under reverse-direction impact scenarios as well as to select the CIP. Recommendations were also provided for conducting a Phase II study and evaluating the nested Midwest Guardrail System (MGS) configuration using three Test Level 3 (TL-3) full-scale crash tests according to the criteria provided in the Manual for Assessing Safety Hardware, as published by the American Association of Safety Highway and Transportation Officials (AASHTO).
Author: Jennifer D. Rasmussen
Publisher:
ISBN:
Category : Bridges
Languages : en
Pages : 321
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Book Description
A Manual for Assessing Safety Hardware (MASH) Test Level 3 (TL-3) approach guardrail transition (AGT) was designed to connect the Midwest Guardrail System (MGS) to a MASH TL-4 steel-post, steel-tube, bridge rail, Type IL-OH. Two connection concepts were evaluated using the LS-DYNA finite element analysis computer software. The second concept was selected for further evaluation with full-scale crash testing, which included a previously-developed, thrie-beam, approach guardrail transition, modified HSS8x6x1/4 transition tube rails that aligned with the lower and middle bridge rail tubes, and new connection hardware designed to prevent vehicle snag during reverse-direction impacts. The critical impact points were selected using LS-DYNA for MASH test designation nos. 3-20 and 3-21 in the impact direction from the thrie-beam to the bridge rail. MASH test designation nos. 3-20 and 3-21 in the impact direction from the bridge rail to the thrie-beam AGT were determined to be non-critical. In test no. STBRT-1, the 2,404-lb small car impacted the AGT at a speed of 64.6 mph, an angle of 25.2 degrees, and at a location 21.3 in. upstream from post no. 19, thus resulting in an impact severity of 60.9 kip-ft. The small car was contained and redirected and resulted in a successful test according to MASH test designation no. 3-20 safety performance criteria. In test no. STBRT-2, the 5,007-lb quad cab pickup truck impacted the AGT at a speed of 62.7 mph, an angle of 24.9 degrees, and at a location 15.9 in. upstream from post no. 19, thus resulting in an impact severity of 116 kip-ft. The pickup truck was contained and redirected and resulted in a successful test according to MASH test designation no. 3-21 safety performance criteria.
Author:
Publisher:
ISBN:
Category : Roads
Languages : en
Pages : 378
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Book Description
Author: Chuck A. Plaxico
Publisher: Transportation Research Board
ISBN: 0309088208
Category : Technology & Engineering
Languages : en
Pages : 106
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Book Description
At head of title: National Cooperative Highway Research Program.
Author: Robert W. Bielenberg
Publisher:
ISBN:
Category : Roads
Languages : en
Pages : 49
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Book Description
The report provides general guidance for the installation of the Midwest Guardrail System (MGS) adjacent to slopes. This guidance included recommended barrier configurations adjacent to slope, discussion of dynamic deflection and working width, and recommendations regarding the use of MGS special applications with slopes.
Author: American Association of State Highway and Transportation Officials. Task Force for Roadside Safety
Publisher: AASHTO
ISBN: 1560515090
Category : Technology & Engineering
Languages : en
Pages : 345
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Book Description
"The Roadside Design Guide presents a synthesis of current information and operating practices related to roadside safety and is written in dual units-metric and U.S. Customary. This book is a guide. It is not a standard, nor is it a design policy. It is intended to use as a resource document from which individual highway agencies can develop standards and policies. Although much of the material in the guide can be considered universal in its application, several recommendations are subjective in nature and may need modification to fit local conditions. However, it is important that significant deviations from the guide be based on operational experience and objective analysis. The 2011 edition of the AASHTO Roadside Design Guide has been updated to include hardware that has met the evaluation criteria contained in the National Cooperative Highway Research Program (NCHRP) Report 350: Recommended Procedures for the Safety Performance Evaluation of Highway Features and begins to detail the most current evaluation criteria contained under the Manual for Assessing Safety Hardware, 2009 (MASH). For the most part, roadside hardware tested and accepted under older guidelines that are no longer applicable has not been excluded in this edition." -- AASHTO website.
Author:
Publisher:
ISBN:
Category : Culverts
Languages : en
Pages : 157
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Book Description
Author: Nauman Mansoor Sheikh
Publisher:
ISBN:
Category : Automobiles
Languages : en
Pages : 0
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Book Description
Researchers at the Texas A&M Transportation Institute (TTI) designed and tested a Manual for Assessing Safety Hardware (MASH) Test Level 4 (TL-4) compliant metal guardrail system. The researchers first developed several preliminary design concepts of the guardrail system, one of which was selected by the Texas Department of Transportation (TxDOT) for further development through simulation and crash testing. The researchers then developed a full-scale finite element model of the selected system and performed impact simulations under MASH TL-4 impact conditions. Using the results of these impact simulations, the researchers made further improvements to the guardrail design and developed the final system design details for crash testing. TTI then constructed the guardrail installation and performed MASH Test 4-12 with a single unit truck, MASH Test 4-11 with a pickup truck, and MASH Test 4-10 with a small car to meet MASH TL-4 compliance criteria for longitudinal barriers. This report provides details of the guardrail design development, the crash tests and results, and the performance assessment of the guardrail system for MASH TL-4 longitudinal barrier evaluation criteria. The design developed under this research project provides a MASH TL-4 compliant guardrail system that allows TxDOT to provide enhanced roadside safety in corridors that experience above-average heavy vehicle traffic.
Author: James C. Kovar
Publisher:
ISBN: 9780309709538
Category : Roads
Languages : en
Pages : 0
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Book Description
"Roadside obstacles are often too close to the roadway to permit the installation of common guardrail designs. Guardrail systems are often modified with a combination of tighter post spacing, nesting of rails, and other guardrail stiffening mechanisms to reduce deflections. NCHRP Research Report 1100: MASH TL-3 Deflection Reduction for 31-Inch Guardrail: A Guide, from TRB's National Cooperative Highway Research Program, presents a guide on the use of stiffening mechanisms to reduce the deflection for 31-inch guardrail installations while maintaining system integrity and safety performance. Supplemental to the report are two presentations summarizing the project, one including videos of crash testing and another without the crash-testing videos."--publisher's website
